Study of hardening of nano-modified cement paste using ultrasound (Master thesis)

Συλάκος, Γεώργιος

This post-graduate thesis aims at studying the hardening of nano-modified cement paste using ultrasound. The nano- modified cement paste consists of multi-wall carbon fiber, cement and water. The motivation of this study is the growing interest in research on nano-reinforcing building materials. Last, there is an effort to create composite materials modified by adding nano-materials contributing to changing their existing properties in order to improve them. Meanwhile, research and academia are studying the effect of nano-technology in the world of materials. Studies on nano-materials used to enforce building materials such as concrete, mortar or cement paste, are at an early stage so that the results of each study conducted constantly questioned but taken as a basis for further investigations. In the research conducted a series of experiments in cement paste in which the percentage of nano-reinforcement with cement was changed as well as the water percentage of water with the nano- modified cement. The measurements were started immediately after placing the sample in sampler and the sizes we measured were the speed, range and modulus elasticity, sizes able to give us important information about the efficiency of the structure and the best time in which this is achieved. In the first chapter, reference is made to cement, where its definition is given and reference is made to the production process, chemical composition, cement categories, cement and cement paste properties and cement hydration. In the same chapter is presented the hydration process, a mechanism which significantly influences the final properties of the cement paste. In the second chapter, reference is made to nanotechnology. Ιnitially refers to the impact of nanotechnology on construction, building materials and expected developments. They then refer to nano materials, their synthetic methods and their uniformity. In the third chapter, reference is made to carbon nanotubes. Initially reference is made to their structure, morphology and their properties. Τhen refers to the applications, the methods of production and their characterization. Finally, reference is made to the application of carbon nanotubes to cementitious materials. In the fourth chapter, reference is made to non-destructive tests and their methods of application. In the same chapter is presented non-destructive testing using Ultrasound with reference to ultrasound theory and control procedure to be followed. In the fifth chapter we describe the experimental part and in particular with pictures the preparation of carbon nanotubes suspension, the experimental procedure and the experimental device was used. Also, the results of the experiments are presented with diagrams of the propagation velocity in time as well as the elastic modulus in time of the specimens and the observations - comments on them. Finally, in the sixth chapter are mentioned the conclusions that follow from the observations made during the analysis of the results. Suggestions for further research on this subject are also provided.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Μηχανικών Επιστήμης Υλικών
Subject classification: Τσιμέντο
Keywords: Νάνο-τροποποιημένη τσιμεντόπαστα,Nano-modified cement paste
Appears in Collections:Διατριβές Μεταπτυχιακής Έρευνας (Masters)

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